Permeable fireproof materials for aluminium refining and process for preparing same

A technology of refractory materials and auxiliary materials, applied in the field of breathable refractory materials, can solve the problems of inability to remove tiny gases or oxide inclusions, large differences in physical and chemical properties of various parts of products, and large fluctuations in air permeability and flow rate of products. The effects of uniform and stable physical and chemical properties, shortened refining time, and uniform temperature and composition

Inactive Publication Date: 2006-12-27
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional refractory materials currently used in the aluminum smelting industry are bauxite or coke materials, and SiO in bauxite or coke materials 2 , Fe 2 o 3 and TiO 2 It can react with pure aluminum or aluminum alloy to reduce to simple substance, which will seriously pollute the molten aluminum
[0005] Generally, refractory products are formed by a friction brick press or a hydraulic press, but for formed breathable products, if the above-mentioned press is used to form, the structure of each part inside the product will be uneven, resulting in large differences in the physical and chemical properties of each part of the product, and the air permeability and flow rate of the product. The fluctuation is large, and the internal pores are large and open, so that when the gas passes through the breathable product, the bubbles blown out are relatively large, which not only fails to remove tiny gases or oxide inclusions, but also introduces larger inclusions to pollute the aluminum liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Raw material composition weight ratio for preparing breathable refractories:

[0021] 92% of dense calcium hexaaluminate is sintered and synthesized, 75% of which has a particle size of 0.5-2mm, and the shape of the particles is round and oval without sharp edges and corners, and the particle size is 17% of 200 mesh;

[0022] The particle size is 200 mesh kyanite 5%;

[0023] Soft clay 3%;

[0024] Dextrin (additional) 2%;

[0025] Carboxymethylcellulose (extra) 1%.

[0026] Fully mix the above raw materials, put them into the molding mold, put them on the platform of the vibration press molding machine, the pressurization pressure is 15 tons, the vibration platform vibrates at the same time of pressurization, the amplitude is 3mm, the vibration time is 5 seconds, and finally the high temperature is fired at 1600 ℃ . Made of breathable refractory material flow rate (0.3MPa) 40Nm 3 / h, normal temperature compressive strength 39Mpa.

Embodiment 2

[0028] Raw material composition weight ratio for preparing breathable refractories:

[0029] Sintered and synthesized dense calcium hexaaluminate 67%, of which the particle size is 2-1 mm50% 200 mesh 17%; the particle size is 0.5-2 mm tabular alumina 25%;

[0030] The particle size is 200 mesh kyanite 5%;

[0031] Soft clay 3%;

[0032] Dextrin (additional) 2%;

[0033] Carboxymethylcellulose (extra) 1%. Among them, the sintered and synthesized dense calcium hexaaluminate and tabular corundum with a particle size of 2-1 mm are round and oval without sharp edges.

[0034] The above raw materials are fully mixed, put into the forming mold, placed on the platform of the vibration pressurization molding machine, and the pressure is 16 tons. The vibration platform vibrates at the same time as the pressurization, the amplitude is 5mm, and the vibration time is 9 seconds. Finally, it is fired at a high temperature of 1500°C. Flow rate (0.3MPa) 45Nm made of breathable refractory m...

Embodiment 3

[0036] Raw material composition weight ratio for preparing breathable refractories:

[0037] Sintered and synthesized dense calcium hexaaluminate 67%, of which the particle size is 2-1mm 35% 1-0.5mm 15% 200 mesh 17%;

[0038] 25% tabular corundum with a particle size of 2-1 mm;

[0039] The particle size is 200 mesh kyanite 5%;

[0040] Soft clay 3%;

[0041] Dextrin (additional) 2%;

[0042]Carboxymethylcellulose (extra) 1%. Among them, the sintered and synthesized dense calcium hexaaluminate and tabular corundum with a particle size of 2-1 mm are round and oval without sharp edges.

[0043] Fully mix the above raw materials, put them into the molding mold, put them on the platform of the vibration pressurization molding machine, pressurize 15 tons, and vibrate the vibration platform at the same time as pressurization, the amplitude is 4mm, the vibration time is 10 seconds, and finally fired at a high temperature of 1550°C . Flow rate (0.3MPa) 45Nm made of breathable re...

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Abstract

The invention discloses a poromeric fire-proof material and preparing method of refined aluminum, which comprises the following parts: 60-92 percent sintered compact calcium hexaluminate, 8-30 percent auxiliary material and 2.5-5.5 percent binder, wherein the auxiliary material is some or all of board-shaped corundum, electric melting white corundum, mild-clay, quartz, kyanite, chromium hemitrioxide green and zircon. The preparing method comprises the following steps: blending poromeric fire-proof material and binder completely; loading the material in the mould; placing the mould on the vibrating platform; pressurizing on the material at 10-20 ton; vibrating at 3-5 mm amplitude at 5-15 s; sintering at 1400-1700 deg.c.

Description

technical field [0001] The invention belongs to a breathable refractory material for aluminum smelting, refining and casting process equipment in the aluminum deep processing industry (including a heat preservation static furnace, a chute and a degassing box for an online refining device outside the furnace), and mainly relates to a breathable refractory material for aluminum refining and its Preparation. It can effectively improve the quality of molten aluminum and is simple and easy to implement. Background technique [0002] The smelting process of aluminum alloy includes a series of physical and chemical changes, and its characteristics are: 1. Long melting time; 2. Easy to oxidize; 3. Easy to absorb gas; 4. Easy to absorb metal impurities. Therefore, it is very easy to be polluted during the smelting process. Preventing the contamination of impurities is an important issue in the smelting of aluminum and aluminum alloys. [0003] Purification of aluminum alloy melt i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 张晖禄向阳刘志宏尹洪丽窦景一
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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